as long as it's consistent fer whole cart... yes.  it's done in custom shipping logic.  If it's not consistent you will need to hire a pro to help ya.
code to add to the shipping logic would like like this:
$shipping_price = 1.5;
 if (($total_quantity) > 1){
$shipping_price = $shipping_price  + (($total_quantity - 1) * .50);
                 }
That should paste into the shipping box somewhere... but play with it :)
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